Mullooly J P
Am J Public Health. 1987 May;77(5):626-7. doi: 10.2105/ajph.77.5.626.
A randomized controlled trial demonstrated that a single mailed influenza vaccination cue increased the vaccination rate among elderly HMO members with high-risk chronic conditions (n = 2217) from 30 per cent to 39 per cent during the fall and winter of 1984/85.
一项随机对照试验表明,在1984/85年秋冬季节,向患有高危慢性病的老年健康维护组织(HMO)成员(n = 2217)邮寄一次流感疫苗接种提示,可使疫苗接种率从30%提高到39%。